Stable-isotope ratios and accumulation rates of four firn cores from the Dronning Maud Land, Antarctica
Cobertura |
MEDIAN LATITUDE: -71.414736 * MEDIAN LONGITUDE: -8.293342 * SOUTH-BOUND LATITUDE: -72.064000 * WEST-BOUND LONGITUDE: -9.916700 * NORTH-BOUND LATITUDE: -70.650000 * EAST-BOUND LONGITUDE: -6.667000 * DATE/TIME START: 1981-01-15T00:00:00 * DATE/TIME END: 2007-02-01T23:59:00 |
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Data(s) |
05/11/2010
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Resumo |
Four firn cores were retrieved in 2007 at two ridges in the area of the Ekström Ice Shelf, Dronning Maud Land, coastal East Antarctica, in order to investigate the recent regional climate variability and the potential for future extraction of an intermediate-depth core. Stable water-isotope analysis, tritium content and electrical conductivity were used to date the cores. For the period 1981-2006 a strong and significant correlation between the stable-isotope composition of firn cores in the hinterland and mean monthly air temperatures at Neumayer station was (r=0.54-0.71). No atmospheric warming or cooling trend is inferred from our stable-isotope data for the period 1962-2006. The stable-isotope record of the ice/firn cores could expand well beyond the meteorological record of the region. No significant temporal variation of accumulation rates was detected. However, decreasing accumulation rates were found from coast to hinterland, as well as from east (Halvfarryggen) to west (Søråsen). The deuterium excess (d) exhibits similar differences (higher d at Søråsen, lower d at Halvfarryggen), with a weak negative temporal trend on Halvfarryggen (0.04 per mil/a), probably implying increasing oceanic input. We conclude that Halvfarryggen acts as a natural barrier for moisture-carrying air masses circulating in the region from east to west. |
Formato |
application/zip, 32 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.753185 doi:10.1594/PANGAEA.753185 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
Fernandoy, Francisco; Oerter, Hans; Meyer, Hanno (2008): Spatial variability in isotope signatures of precipitation around Neumayer station, East Antarctica. SCAR-IASC Open Science Conference, St. Petersburg, Russia, 8-11 July 2008, hdl:10013/epic.30800.d001 Oerter, Hans; Fernandoy, Francisco; Meyer, Hanno; Wilhelms, Frank; Graf, Wolfgang; Stichler, Willibald (2008): Accumulation and stable-isotope content in the hinterland of Neumayer station, Antarctica, since the IPY 1957/58. SCAR-IASC Open Science Conference, St. Petersburg, Russia, 8-11 July 2008, hdl:10013/epic.30805.d001 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Fernandoy, Francisco; Meyer, Hanno; Oerter, Hans; Wilhelms, Frank; Graf, Wolfgang; Schwander, Jakob (2010): Temporal and Spatial variation of stable-isotope ratios and accumulation rates in the hinterland of Neumayer station, East Antarctica. Journal of Glaciology, 56(198), 673-687, doi:10.3189/002214310793146296 |
Palavras-Chave | #3H depos; Acc rate ice; Accumulation rate ice, water equivalent; Age; AGE; ANT-XIX/2; AWI_Glac; B38; B39; Calculated; Calculated from weight/volume; Conductivity, electrolytical; Conductometry; d=d2H - 8*d18O; d18O H2O; Date/Time; DATE/TIME; dD; delta 18O, water; delta Deuterium; Density; Density, mass density; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; Depth bot; Depth ice/snow; Depth top; Depth w.e. bot; Depth w.e. top; Depth water equivalent, bottom; Depth water equivalent, top; Deuterium excess; DML641C02_01; DML651C02_03; DML94C07_38; DML95C07_01; DML95C07_02; DML95C07_03; DML96C07_39; DML97C07_04; Dronning Maud Land, Antarctica; d xs; EC; EPICA; European Project for Ice Coring in Antarctica; FB0201; FB0202; FB0203; FB0701; FB0702; FB0703; FB0704; FIRN; Firn auger; for year of deposition; Georg von Neumayer; Glaciology @ AWI; GVN; ICEDRILL; Ice drill; Mass spectrometer Finnigan Delta-E; Mass spectrometer Finnigan Delta-S; measured at Neumayer Station; Monitoring station; MONS; NM02C02_02; Polarstern; Pre-IPICS; PS61; Sampling/drilling ice; Scintillation; t; Temperature, ice/snow; Thermistor; Thermometer; Tritium; Tritium, deposition; Tritium, standard deviation; TRITUM; TRITUM std dev; WCRP/GEWEX |
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Dataset |